FilterBinder - manywidgets

Drive a lonboard layer’s filter_range from a RangeSlider (uses the layer’s DataFilterExtension).

Import¶

from manywidgets.lonboard import FilterBinder

Example¶

from lonboard import Map, ScatterplotLayer
from lonboard.layer_extension import DataFilterExtension
from manywidgets import RangeSlider, Column
from manywidgets.lonboard import FilterBinder

layer = ScatterplotLayer.from_geopandas(
    gdf,
    extensions=[DataFilterExtension(filter_size=1)],
    get_filter_value=values,           # one float per row
    filter_range=(lo, hi),
)
m = Map(layer, basemap=None)
slider = RangeSlider(min=lo, max=hi, low=lo, high=hi)
binder = FilterBinder(slider, layer)   # slider.low/high -> layer.filter_range

Column(slider, binder, m)

API¶

Trait	Type	Default	Description
`source`	Instance	—	The slider providing low/high values.
`layer`	Union	—	A single lonboard layer, or a list of layers, to filter.
`low_field`	Unicode	`'low'`	Source trait for the low bound.
`high_field`	Unicode	`'high'`	Source trait for the high bound.
`filter_field`	Unicode	`'filter_range'`	Layer trait to write [low, high] to.
`label`	Unicode	`''`	Optional status label.
`widget_id`	Unicode	`''`	Stable unique id used for cross-widget linking (auto-assigned).

For single-ended filtering, pass a Slider and set low_field=high_field="value". Use seconds (not milliseconds) for time filters (see the lonboard guide).